I would like to suggest you the papers in the link : https://au.mathworks.com/matlabcentral/fileexchange/72412-discrete-orthogonal-moments-for-iris-recognition
https://au.mathworks.com/matlabcentral/fileexchange/41250-discrete-orthogonal-polynomial-toolbox-dopbox-version-1-8 and https://au.mathworks.com/matlabcentral/fileexchange/33975-the-seven-invariant-moments